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US 10,872,655 B2Granted
DRAM memory chips quick optical erasure
OwnerGoran Krilicinventor
Life of this patent
Estimating the term…
Abstract
Instant optical DRAM data erasure can be performed. In wafer level packaging (chip scale package) die is usually on top (flip-chip) and metal interconnections does not interfere with penetrating light during chip illumination. IR light penetrates through chip's thin epoxy on top and deeply into die. Light is absorbed in the die, near active layer, generating electron-hole pairs. Electron-hole pairs diffuse to chip active layer and generate discharging photocurrents in DRAM capacitors.
Claims6
A Dynamic Random Access Memory chip comprising:
- a substrate;
- an active layer;
- and
- data charge nodes;
- wherein said Dynamic Random Memory chip is stacked between a lower chip and an upper chip, and positioned relative to a near infrared light source such that said Dynamic Random Access Memory chip is optically illuminated by said near infrared light source, near infrared light penetrates through said upper chip to be partially absorbed in said Dynamic Random Access Memory chip's substrate, generating charge carriers that diffuse to said Dynamic Random Memory chip's active layer and discharge said Dynamic Random Access Memory chip's data charge nodes.
2 more elements
A Static Random Access Memory chip comprising:
- a substrate;
- an active layer;
- and
- floating data charge nodes;
- wherein said Static Random Memory chip is stacked between a lower chip and an upper chip, and positioned relative to a near infrared light source such that said Static Random Access Memory chip is optically illuminated by said near infrared light source, near infrared light penetrates through said upper chip to be partially absorbed in said Static Random Access Memory chip's substrate, generating charge carriers that diffuse to said Static Random Memory chip's active layer and discharge said Static Random Access Memory chip's floating data charge nodes.
2 more elements
Dependencies are inferred from the claim text.